Not sure but to be safe keep decrypting them with your current character. Not the low level one.
Better piece of advice. You want 6 coins guaranteed? Power level lower character to 20 and then get carried through weekly heroic. That'll get you 3. You get one coin from story mission in Venus. That's 4.
Finally find four golden chests in mars on patrol with each character. The fourth chest always gives a strange coin. That's 2 for a total of 6.
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Need them today , so that won't work for me though .. But thank you sir !